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Balanced headphone & pre-amplfier with integrated digital analogue converter based on flaship from Sabre, the ES9038Pro All parts and components are selected based on excellent sonic and measurements performance. Components are e.g. from DALE resistors (USA), WIMA capacitors (Germany) and NOVER parts (UK) . The used components but also the technical design (e.g. discrete analogue section) of this system were being selected after many years of experience and practices and are considered to perform and provide sublim sonic results. Supporting todays high resolutions and up to date interfaces like USB and I2S.

80 steps volume control in both high gain mode and low gain mode. smooth volume level control

Static storage control software to avoid degrade sound quality, the MCU will be disabled when inactive

DIGITAL INPUTS

1. USB input.

2. I2S Asynch. input (RJ45)

3. Toslink optical SPDIF

4. RCA coaxial SPDIF

ANALOGUE INPUTS

5. RCA

6. XLR (balanced)

OUTPUTS

Outputs can be set to variable or fixed

ACSS balanced

XLR balanced

RCA single ended

Headphone (4-pin) XLR balanced

Headphone 6,3mm jack single ended

HIGH PRECISION VOLUME CONTROL

Volume control consist of relay-controlled attenuators. Fully-independent, fully-balanced stereo volume controls. The volume controls feature consist of high-precision 0.05% tolerance film resistors and golden contact relays. Buffered inputs and outputs.There 4 channels volume boards are built in the unit to achieve ultimate balanced volume control. They are controlled by a digital signal controlling the high quality relays switching the precision resistors in analog area.

Audio-GD lineair volume characteristic

Volume steps in comparison to standard volume control

Quality of volume control is very important in balanced applications . It have to effectuate the four channels to work as synchronous as possible to keep the balanced signal in perfect shape. In traditional volume controls the balanced output will introduce distortion which will negatively influence sound quality and performance and might even get worse than a single ended setup and waste the advantages of balanced designed solution.

ANALOGUE OUTPUT STAGES

The final step the of the signal flow are the analog output stages, they can have a massive effect the total sound quality. The output stages are directly placed behind the ES9038 pro dac chip and they are built with discrete transistors through-hole components becuase this offers the best results we discovered after many years of experience. The high speed ACSS (propitiatory Audio-GD current driven signal processing system) are non feedback designed; the ES9038 pro output is in current mode amplified by the ACSS amp. No shortcuts are taken; a complete current driven solution. The output buffers are the pure class A to drive difficult headphone without any problem. The class A output stages will make sure you will get the most pure and real sound reproduction.

The filter Settings are for personal preference. The default setting is typically the best for most listeners. Feel free to adjust it according to your preference after you are familiar with the sound. IIR stands for Infinite Impulse Response. These settings will likely not offer significant sonic difference.